I've signed up for a ride later this month. I'm a 44 y/o male who's in reasonably good shape (I run mostly, but also do road biking and triathlons-- I've run a marathon, completed a century road bike ride, and done a few sprint distance triathlons). I am just starting to get into mountain biking and thought I would sign up for this trail ride. It's 50 miles of single track and gravel (we don't have many hills here in Florida). I have a Trek 880 Antelope bike that is in pretty good condition. My question is, am I crazy, stupid, or both? Do you think I can make it through this ride? Or am I wasting my time and money??? The trail has ratings from beginner to intermediate to challenging. Is challenging the highest category? Any opinions you can give would be appreciated.